find the perimeter of a semi circle

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Question:r^4
Is it that formula?
The radius is 4
3.14x 4= 12.56
what do i do with that ^4?
1st question is that the right formula?

Answers:Taking this question and breaking it down -
The formula -
Perimeter of a full circle is 2 * pi * r or pi * diameter
for a semi-circle or half of a circle you need to also add a diameter for the line that connects the open circle .... so, In the form that you can use r in the calculation :
(( 2 r ) / 2 ) + 2 r or r + 2 r or r ( +2)
For your answer
r = 4
4 ( 3.14 + 2) = 20.56 inches
I hope this helps. Keep pluggin

Question:

Answers:C = 2pi*r
then
C/2 = pi*r

Question:Hi, I am in Maths and my teacher has asked me to find the perimeter of a semi-circle. I need the formula so please help! (No stupid answers please :l)

Answers:The circumference of a circle is given by the formula:
C = 2 r
where r is the radius of the circle.
A semi-circle would be one-half of the full circumference !
We usually call the distance around a circle the circumference rather than the perimeter.
QED

Question:I've got to try and finish this calculus homework but I can't remember the formula.

Answers:Volume of a hemi-sphee is 2*pi*r^3/3
If it is thesurface area of a solid hemisphere that you want to know,it is 3*pi*r^2
Perimeter of a semi-circle is pi*r+2r

From Youtube

Finding the perimeter of a semi-circle :This short video tutorial shows you how to find the perimeter of a semi-circle. For interactive applets, worksheets, and more videos, please visit www.mathvillage.info

Basic Mathematics & Algebra : How to Find Perimeter of Semi Circle :Finding the perimeter of a semi circle involves a math formula that starts with C equals two Pi R. Formulate the rest of the perimeter math equation to find the circumference of a semi circle with assistance from a math teacher in this free video on mathematics. Expert: Jimmy Chang Bio: Jimmy Chang has been a math teacher at St. Pete College for nearly a decade. He has a master's degree in math, and his specialties include calculus, algebra, liberal arts, math and trigonometry. Filmmaker: Christopher Rokosz